KEYENCE BL-180 - Manual (Page 21)

2.2 Read modes
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2.2.3 Multi-label read mode 2 (Multi 2)
As with multi 1 mode, this mode allows the unit to read several bar codes contin-
uously while the trigger input is on. (The number of bar codes that can be read
depends on the buffer capacity. See page 48.) The difference between the two
modes is that multi 2 modesends all the readout data at one time after the trigger
input turns off.
Multi-label read mode 2 operation
Multi 2 mode allows the unit to read several bar codes while the trigger input is on
(or during the preset input time if one-shot signal trigger is selected) and sends all
the readout data at one time after the trigger input turns off (or after the preset
input time is expired if one-shot signal trigger is selected).
To prevent the unit from reading the same bar code twice, the time for one bar
code to pass across the LED light’s field and read, plus the repeat reading time
must be set. During the repeat reading time, the unit cannot read the same bar
code repeatedly, but can read different bar codes.
For OK/NG output, after trigger input turns off, “OK” turns on if the unit reads at
least one bar code and “NG” turns on if the unit fails to read a bar code. (Compar-
ison to the preset data is not performed.)
Reading data format
Each data packet is separated by a comma (, : 2CH) (intermediate delimiter).
The unit sends as many data packets the number of bar codes read.
See page 46 for “header string” and “delimeter”.
2.2.4 Multi-label read mode 3 (Multi 3)
As described in multi-label read modes 1 and 2, this mode also allows the unit to
read several bar codes (up to 4 codes) while the trigger input is on.
The unit sends the readout data at one time according to a specified sequence
after the trigger input turns off. When up to 4 codes are in the LED beam’s field,
the unit can simultaneously reads all of them.
Repeat reading
time
1 2 3 4 5
1 2 3 4 5
OK NG
<Succeed to read> <Fail to read>
Trigger input
Bar code
LED beams
Communication time
OK/NG output
Header
1st
data
,
2nd
data
,
3rd
data
,
4th
data
, Delimeter